Rare top-quark decay t→b b ¯ b W +

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Resumo

The calculation of the rare t-quark decay t→bbbW+ within the Standard Model as well as the charged Higgs contribution to this decay is presented. The role of possible background processes is discussed.

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Sobre autores

S. Slabospitsky

NRC “Kurchatov Institute” — IHEP

Autor responsável pela correspondência
Email: Sergey.Slabospitsky@ihep.ru
Rússia, Protvino

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2. Fig. 1. Diagram describing the decay H+ → t*b → W+bb due to the contribution of the virtual t-quark.

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3. Fig. 2. Probabilities of H±-boson decays in three channels for four values of M(H+) masses as a function of tanβ (the mass values indicated are in GeV).

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4. Fig. 3. Allowed region of parameters of the charged Higgs boson.

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5. Fig. 4. Diagrams describing the decay t → bW+bb within the SM framework.

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6. Fig. 5. Diagram describing the contribution of a charged boson to the decay t → bW+bb.

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7. Fig. 6. Diagrams describing the decay t → bbb +νl, in which the lepton pair +νl is not formed from a virtual W boson.

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8. Fig. 7. Diagrams describing the decay t → bbbcs, in which the cs pair is not formed from a virtual W boson.

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9. Fig. 8. Distribution of the invariant mass of the cs pair in the decay t → bbbcs. The sharp peak on the right corresponds to the decay of the virtual W boson into a pair of cs quarks. The wide part on the left corresponds to the contribution in which cs is not formed from the virtual W boson.

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